Harden qr init secret handling and config recovery

[baanish]

Summary

Makes qr init safe to rerun after corrupt/partial config and avoids writing API keys insecurely to config.toml.

• Dispatches qr init before AppConfig::load() so a broken config cannot block recovery
• Recreates config when missing or invalid
• Adds atomic::write_private() for Unix 0600 config creation from the first byte
• Applies keychain storage to fallback provider keys with explicit messaging when config storage is used
• Adds CLI regression tests for corrupt-config recovery, permissions, and fallback keychain behavior

Test plan

• cargo test
• cargo fmt --all -- --check
• cargo clippy --all-targets --locked -- -D warnings

  

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Free

Run ID: b77089ea-a9ad-4cb4-b65d-cb02411b0a7a

📥 Commits

Reviewing files that changed from the base of the PR and between fcf57af and 3baf7d7.

📒 Files selected for processing (6)

• src/ai/client.rs
• src/atomic.rs
• src/config.rs
• src/main.rs
• src/secret.rs
• tests/cli.rs

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Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• src/ai/client.rs
• src/config.rs
• src/main.rs
• src/secret.rs
• tests/cli.rs

Previous Review Summary (commit d27b0fd)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit d27b0fd)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• src/atomic.rs
• src/config.rs
• src/main.rs
• src/secret.rs
• tests/cli.rs

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_{Reviewed by glm-5.2-short · Input: 18.5K · Output: 3.2K · Cached: 152.1K}